<template>
  <div>
    <!-- <p class="error">{{ error }}</p> -->
    <!--错误信息-->

    <!-- <p class="decode-result">
        扫描结果:
        <b>{{ result }}</b>
    </p> -->
    <!--扫描结果-->
    <!-- <p @click="openCamera">打开相机</p>
    <div v-show="show" class="cameraMessage">
        <p @click="closeCamera">关闭相机</p>
        <p @click="openFlash">打开手电筒</p>
        <p @click="switchCamera">相机反转</p>
    </div> -->

    <qrcode-stream
        v-show="qrcode"
        :camera="camera"
        :torch="torchActive"
        @decode="onDecode"
        @init="onInit"
        style="height: 100%">

      <div>
        <div class="qr-scanner">
          <div class="box">
            <div class="line"></div>
            <div class="angle"></div>
          </div>
          <div class="txt">
            请将二维码放入框内
          </div>
        </div>
      </div>

    </qrcode-stream>
  </div>
</template>

<script>

// 引入
import { QrcodeStream } from 'vue-qrcode-reader';
import Vue from "vue";

export default {
  name: "qrcode",
  // 注册
  components: { QrcodeStream },

  data() {
    return {
      result: '', // 扫码结果信息
      error: '', // 错误信息
      // show: false,
      // qrcode: false,
      qrcode: true,//解码组件显示
      torchActive: false,//手电筒
      camera: 'front',
    };
  },

  methods: {
    onDecode(result) { //扫码结果回调
      // console.log(result);
      if(Date.now()< result.split(" ")[1]){
        this.result = result.split(" ")[0];
        this.closeCamera()
        this.$emit("listen",this.result)
      }else{
        alert("二维码失效！")
      }
    },
    async onInit(promise) { //检查是否调用摄像头
      const { capabilities } = await promise;

      const TORCH_IS_SUPPORTED = !!capabilities.torch;
      try {
        await promise;
      } catch (error) {
        if (error.name === 'NotAllowedError') {
          this.error = 'ERROR: 您需要授予相机访问权限';
        } else if (error.name === 'NotFoundError') {
          this.error = 'ERROR: 这个设备上没有摄像头';
        } else if (error.name === 'NotSupportedError') {
          this.error = 'ERROR: 所需的安全上下文(HTTPS、本地主机)';
        } else if (error.name === 'NotReadableError') {
          this.error = 'ERROR: 相机被占用';
        } else if (error.name === 'OverconstrainedError') {
          this.error = 'ERROR: 安装摄像头不合适';
        } else if (error.name === 'StreamApiNotSupportedError') {
          this.error = 'ERROR: 此浏览器不支持流API';
        }
      }
    },
    // 打开相机
    // openCamera() {
    //     this.camera = 'rear'
    //     this.qrcode = true
    //     this.show = true
    // },
    //关闭相机
    closeCamera() {
        this.camera = 'off'
        this.qrcode = false
        this.show = false
    },
    // 打开手电筒
    // openFlash() {
    //     switch (this.torchActive) {
    //         case true:
    //             this.torchActive = false
    //             break
    //         case false:
    //             this.torchActive = true
    //             break
    //     }
    // },
    // 相机反转
    // switchCamera() {
    //     // console.log(this.camera);
    //     switch (this.camera) {
    //         case 'front':
    //             this.camera = 'rear'
    //             console.log(this.camera)
    //             break
    //         case 'rear':
    //             this.camera = 'front'
    //             console.log(this.camera)
    //             break
    //     }
    // }
  },
};
</script>
<style scoped>
.error {
  font-weight: bold;
  color: red;
}
.cameraMessage {
  width: 100%;
  height: 60px;
}
.qr-scanner {
  background-image: linear-gradient(
      0deg,
      transparent 24%,
      rgba(32, 255, 77, 0.1) 25%,
      rgba(32, 255, 77, 0.1) 26%,
      transparent 27%,
      transparent 74%,
      rgba(32, 255, 77, 0.1) 75%,
      rgba(32, 255, 77, 0.1) 76%,
      transparent 77%,
      transparent
  ),
  linear-gradient(
      90deg,
      transparent 24%,
      rgba(32, 255, 77, 0.1) 25%,
      rgba(32, 255, 77, 0.1) 26%,
      transparent 27%,
      transparent 74%,
      rgba(32, 255, 77, 0.1) 75%,
      rgba(32, 255, 77, 0.1) 76%,
      transparent 77%,
      transparent
  );
  background-size: 30px 30px;
  background-position: -1rem -1rem;
  width: 100%;
  /* height: 100%; */
  height: 300px;
  /* height: 288px; */
  position: relative;
  background-color: #1110;

  /* background-color: #111; */
}
/* .qrcode-stream-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 82px;
  clear: both;
} */
/* .qrcode-stream-wrapper >>> .qrcode-stream-camera {
  width: 213px;
  height: 210px;
  clear: both;
  margin-top: 39px;
} */
.qr-scanner .box {
  width: 300px;
  height: 300px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  overflow: hidden;
  border: 0.1rem solid rgba(0, 255, 51, 0.2);
  /* background: url('http://resource.beige.world/imgs/gongconghao.png') no-repeat center center; */
}
.qr-scanner .txt {
  width: 100%;
  height: 35px;
  line-height: 35px;
  font-size: 14px;
  text-align: center;
  color: rgba(54, 148, 106, 0.8);
  margin: 0 auto;
  position: absolute;
  top: 70%;
  left: 0;
}
.qr-scanner .myQrcode {
  text-align: center;
  color: rgba(54, 148, 106, 0.8);
}
.qr-scanner .line {
  height: calc(100% - 2px);
  width: 100%;
  background: linear-gradient(180deg, rgba(53, 238, 155, 0) 43%, rgba(53, 238, 155, 0.8) 211%);
  border-bottom: 3px solid #00ff33;
  transform: translateY(-100%);
  animation: radar-beam 2s infinite alternate;
  animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
  animation-delay: 1.4s;
}

.qr-scanner .box:after,
.qr-scanner .box:before,
.qr-scanner .angle:after,
.qr-scanner .angle:before {
  content: '';
  display: block;
  position: absolute;
  width: 3vw;
  height: 3vw;

  border: 0.2rem solid transparent;
}

.qr-scanner .box:after,
.qr-scanner .box:before {
  top: 0;
  border-top-color: rgba(53, 238, 155, 0.8);
}

.qr-scanner .angle:after,
.qr-scanner .angle:before {
  bottom: 0;
  border-bottom-color: rgba(53, 238, 155, 0.8);
}

.qr-scanner .box:before,
.qr-scanner .angle:before {
  left: 0;
  border-left-color: rgba(53, 238, 155, 0.8);
}

.qr-scanner .box:after,
.qr-scanner .angle:after {
  right: 0;
  border-right-color: rgba(53, 238, 155, 0.8);
}

@keyframes radar-beam {
  0% {
    transform: translateY(-100%);
  }

  100% {
    transform: translateY(0);
  }
}
</style>